Split VideoBackend::Cleanup from Shutdown.

First is called from ogl/d3d thread, second is called from emulation thread (x11...)

Source/Plugins/Plugin_VideoSoftware/Src/SWmain.cpp

@@ -132,11 +132,17 @@ void VideoSoftware::EmuStateChange(EMUSTATE_CHANGE newState)
 
 void VideoSoftware::Shutdown()
 {
+	// TODO: should be in Video_Cleanup
 	HwRasterizer::Shutdown();
 	SWRenderer::Shutdown();
+	
 	GLInterface->Shutdown();
 }
 
+void VideoSoftware::Video_Cleanup()
+{
+}
+
 // This is called after Video_Initialize() from the Core
 void VideoSoftware::Video_Prepare()
 {

Source/Plugins/Plugin_VideoSoftware/Src/VideoBackend.h

@@ -21,6 +21,7 @@ class VideoSoftware : public VideoBackend
 	void ShowConfig(void* parent);
 
 	void Video_Prepare();
+	void Video_Cleanup();
 
 	void Video_EnterLoop();
 	void Video_ExitLoop();